DigiTrace 920 Series Heat Trace Controller - Pentair Thermal ...

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Range: 0.3 to 100.0 amps(CURRENT TURNS RATIO = 1.00)Procedure: Adjust the CIRCUIT BREAKER CURRENT RATING setting to the heating circuit breakersize (i.e. 30.0 amps). Note that the CIRCUIT BREAKER CURRENT RATING setting is affected by theCURRENT TURNS RATIO setting. The absolute maximum adjusted CIRCUIT BREAKER CURRENTRATING setting is 300.0 amps. The absolute minimum adjusted CIRCUIT BREAKER CURRENTRATING setting is 0.1 amps. See section 3.5.22 on page 26 for more information regarding theCURRENT TURNS RATIO function.IMPORTANT: This feature should not be used to reduce the size of a circuit breaker or increasethe maximum heating cable length. It can be quite effective in preventing nuisance trips due toincorrect design or factors outside those considered by the design.3.5.9 MAXIMUM POWER SETTING (SSR ONLY)Purpose: This user-selectable level limits the maximum amount of power applied to a heattrace circuit. This is an average power calculated by the controller using the average currentand applied voltage. The HTC switches the output on and off rapidly to limit the average currentto an appropriate level. The MAXIMUM POWER level may be adjusted to eliminate step-downtransformers, lower the effective output wattage of a cable, or implement energy management ofthe heat trace circuit.Range: 3 to 33,000 Watts(VOLTAGE and CURRENT TURNS RATIOS = 1.00)Procedure: Adjust the MAXIMUM POWER level to the desired value (watts). Use the TEST TRACINGfunction to observe the power limiting oper-ation.IMPORTANT:• This function may be set within reasonable limits for the particular tracer being powered. Theeffective resolution of the setting is limited to 1/30th of the calculated full on power.• Do not set the MAXIMUM POWER below full output for applications that do not require controlof power.• This feature is affected by the VOLTAGE and CURRENT TURNS RATIO settings. The maximumrange using adjusted values of voltage and current is 65,535 watts. See sections 3.5.21 on page26 and 3.5.22 on page 26 for more information regarding the turns ratio functions.3.5.10 3-PHASE POWER CALCULATION (V3.11 AND UP)Purpose: This parameter selects the type of power calculation that the HTC is to perform.Setting: NO or YESProcedure: If an automatic 3-phase power calculation is desired, select YES. If a normal powercalculation is desired, select NO.IMPORTANT: For the total 3-phase power calculation to be accurate the following conditions mustbe met:• All three phases must be balanced and star (“Y”) connected• The measured corrected current is one of the phase currents• The measured corrected voltage is the line to line voltageThe formula used to calculate this total power is: P total = √3 x I phase x V line-line3.5.11 TS FAIL MODE (V3.11 AND UP)Purpose: This parameter determines whether the HTC turns the output switch ON or OFF if allselected temperature sensors fail to provide a control temperature.Setting: OFF or ONProcedure: If the HTC should turn the output switch off when it cannot read a valid controltemperature, then select OFF; otherwise, if the output switch should turn on, then select ON.IMPORTANT: This parameter is part of the TS CONTROL MODE.THERMAL MANAGEMENT SOLUTIONS EN-DigiTrace920series-IM-H56874 04/13 22 / 82
3.5.12 TEMPERATURE SENSOR CONTROL MODEPurpose: The TS CONTROL MODE allows the selection of one of eleven possible temperaturecontrol modes for the controller. The different modes allow redundant fail-safe temperaturesensing, averaging, or minimum maintain temperature control.Setting: Select one of the following eleven possible modes:Control TS and DescriptionCONTROL USING TS 1, FAIL OFF/ONCONTROL USING TS 1, FAIL TO TS 2CONTROL USING TS 2, FAIL OFF/ONCONTROL USING TS 2, FAIL TO TS 1CONTROL ON AVERAGE, FAIL OFF/ONCONTROL ON AVERAGE, FAIL TO GOODCONTROL ON LOWEST, FAIL OFF/ONCONTROL ON LOWEST, FAIL TO GOODThe following are only available in V3.11+:CONTROL USING EXT. INPUT, FAIL OFF/ONCONTROL USING EXT. INPUT, FAIL TO TS 1CONTROL USING EXT. INPUT, FAIL TO TS 2Where OFF/ON = Controller’s output switch turned OFF or ON as determined by the TS FAIL MODE.Example: With a TS CONTROL MODE of CONTROL ON AVERAGE, FAIL TO GOOD, the controllerwill measure both sensors (TS 1 and TS 2), averaging the two temperature value;, display theresults; and cycle the heater ON or OFF to maintain the CONTROL SETPOINT temperature. Thisis the primary control mode. If either sensor should fail, the controller will transfer control to theremaining “good” sensor and generate the appropriate TS 1 or TS 2 FAILURE ALARM (assumingthat the alarm is enabled). The temperature will now be maintained based on this measured value.If the remaining good sensor fails, the controller will turn the heater OFF or ON as determinedby the TS FAIL MODE setting. The appropriate TS 1 or TS 2 FAILURE ALARM will be also begenerated.Procedure: Select the control mode that best suits the application.IMPORTANT:• Ensure that TS FAILURE ALARMS are enabled. See sections 3.7.1 on page 32, 3.7.4 on page 32,and 3.7.10 on page 34 for a complete explanation of RTD failure detection in the HTC.• If the selected TS CONTROL MODE uses the EXTERNAL INPUT then the EXTERNAL INPUTmust be set to TEMPBUS (see Section 3.6.3). Also, the CONTROL TS FAILURE ALARM is nonlatchingin this mode.• Fail safe mode is always disabled if the TS CONTROL MODE = EXT. INPUT, FAIL OFF/ON.3.5.13 TS 1 TYPE (V3.11 AND UP)Purpose: This parameter specifies the type of RTD that is connected to the HTC’s TS 1 input.Setting: 3-wire 100 Ω platinum or 2-(or 3-) wire 100 Ω nickel-iron (Ni-Fe)Procedure: Select the type of RTD that is connected to the TS 1 input.IMPORTANT: If a 2-wire 100 Ω nickel-iron (Ni-Fe) RTD is selected then the TS 1 LEAD RESISTANCEmust be entered manually (see section 3.5.14 on page 24).3.5.14 TS 1 LEAD RESISTANCE (V3.11 AND UP)(For Ni-Fe RTDs only)Purpose: This parameter specifies the lead resistance of a 2-wire nickel-iron RTD connected tothe HTC’s TS 1 input.Range: 0 to 20.00 ΩProcedure: Measure the resistance of one of the nickel-iron RTD leads (from the RTD to the HTC’sTS 1 input) and use this value as the TS 1 LEAD RESISTANCE.THERMAL MANAGEMENT SOLUTIONS EN-DigiTrace920series-IM-H56874 04/1323 / 82
Page 6 and 7: Section I - Overview1.1 Controllers
Page 8 and 9: CSA C/US and c-ETL-us ApprovedThe 9
Page 10 and 11: 1.5.1 ENCLOSURE ASSEMBLYEnclosure A
Page 12 and 13: The user may want to consider enclo
Page 14 and 15: Temperature SensorsTerminal No.Poin
Page 16 and 17: 2.7.6 INPUT POWERThe 920 controller
Page 18 and 19: Section 3 - Programming and Configu
Page 20 and 21: 3.5.2 ALPHANUMERIC TAG ASSIGNMENTPu
Page 24 and 25: 3.5.15 TS 1 HIGH LIMIT CUTOUTPurpos
Page 26 and 27: IMPORTANT:• Auto-cycling should a
Page 28: 3.6 Common Controller SetupThis is
Page 31 and 32: • This alarm must be enabled and
Page 33 and 34: Procedure: Enable or disable the al
Page 35 and 36: • If the user resets an alarm whi
Page 37 and 38: efore the corresponding alarm will
Page 39 and 40: the overcurrent trip limit and the
Page 41 and 42: the 920 control module, these param
Page 43 and 44: 3.10 Operator Console Functionsbut
Page 45 and 46: eset. All load-shedding parameters
Page 47 and 48: interface.IMPORTANT: The controller
Page 49 and 50: Section 5 - Control Modes5.1 Introd
Page 51 and 52: 5.3 Load Shedding Control ModeLoad
Page 53 and 54: Section 6 - Troubleshooting6.1 Oper
Page 55 and 56: If the bounce or instability is exc
Page 57 and 58: 6.3 Common Alarms—What to look fo
Page 59 and 60: Section 7 - Maintenance7.1 Operator
Page 62 and 63: Appendix B Typical Enclosure Dimens
Page 64 and 65: B.3 Four-Point Assembly #10160-1254
Page 66 and 67: B.5 Twenty-Point Assembly #10160-04
Page 68 and 69: C.1.2 100Ω NICKEL IRON RTD WIRINGC
Page 70 and 71: C.3 Communication Wiring C.3 Commun
Page 72 and 73:
C.5 External Input/Output Port Wiri
Page 74 and 75:
Appendix E 100 Ω Platinum RTD Tabl
Page 76 and 77:
Appendix G Factory Default/Configur
Page 78 and 79:
Other Alarms Configuration Sub-Menu
Page 80 and 81:
Other Alarms Configuration Sub-Menu
Page 82:
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